/// <summary>
/// Walks graph starting from nodes without inputs and then follows connections from them.
/// Calls <paramref name="nodeAction"/> on every node and <paramref name="connectionAction"/> on every connection.
/// <paramref name="nodeAction"/> must set values to all output ports of a node.
/// </summary>
/// <param name="graph">Graph to execute</param>
/// <param name="nodeAction">Action to perform on each node</param>
/// <param name="connectionAction">Action to perform on each connection</param>
/// <returns>Execution result</returns>
/// <exception cref="ArgumentNullException">When <paramref name="graph"/> is null</exception>
/// <exception cref="ArgumentNullException">When <paramref name="nodeAction"/> is null</exception>
public static IGraphExecutionResult Execute(this GraphModel graph, Action <INodeExecutionContext> nodeAction, Action <IConnectionExecutionContext> connectionAction = null)
{
if (graph == null)
{
throw new ArgumentNullException(nameof(graph));
}
if (nodeAction == null)
{
throw new ArgumentNullException(nameof(nodeAction));
}
var ctx = new GraphExecutionContext();
var executionList = GetExecutionList(graph);
for (int i = 0, k = executionList.Count; i < k; ++i)
{
try
{
switch (executionList[i])
{
case NodeModel node:
{
ctx.Node = node;
nodeAction.Invoke(ctx);
ctx.ValidateOutputs();
break;
}
case ConnectionModel connection:
{
ctx.Connection = connection;
connectionAction?.Invoke(ctx);
break;
}
}
}
catch (Exception e)
{
ctx.AddException(e);
}
}
ctx.Node = null;
ctx.Connection = null;
return(ctx);
}
private static async Task <IGraphExecutionResult> ExecuteAsyncInner(GraphModel graph, Func <INodeExecutionContext, Task> nodeAction, Func <IConnectionExecutionContext, Task> connectionAction)
{
var ctx = new GraphExecutionContext();
var executionList = GetExecutionList(graph);
for (int i = 0, k = executionList.Count; i < k; ++i)
{
try
{
switch (executionList[i])
{
case NodeModel node:
{
ctx.Node = node;
await nodeAction.Invoke(ctx);
ctx.ValidateOutputs();
break;
}
case ConnectionModel connection:
{
ctx.Connection = connection;
await connectionAction?.Invoke(ctx);
break;
}
}
}
catch (Exception e)
{
ctx.AddException(e);
}
}
ctx.Node = null;
ctx.Connection = null;
return(ctx);
}